shock - pathophysiology / types & management
TRANSCRIPT
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SHOCK [ Pathophysiology,Types & Mgt ]
Prof. Utham Murali. M.S; M.B.A
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Objectives
Definition
Review basic physiologic aspects of shock
Different categories with Etiology &Clinical features
Management aspects
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Definition
Shock is a physiologic state characterized by systemic reduction in tissue perfusion, resulting in decreased
tissue oxygen delivery.
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Other Ways* It’s a condition, in which circulation fails to meet
the metabolic need of the tissue & at the same time fails to remove the metabolic waste products.
• Inadequate tissue perfusion to meet tissue demands
• Usually result of inadequate blood flow and/or oxygen delivery
• Inadequate peripheral perfusion leading to failure of tissue oxygenation
• Lead to anaerobic metabolism
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Demand Supply
O2 consumption
O2 delivery
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Demand Supply
O2
consumption
O2 delivery
Shock
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Cells switch from aerobic to anaerobic metabolism lactic acid production
Cell function ceases & swells
membrane becomes more permeable
electrolytes & fluids seep in & out of cell
Na+/K+ pump impaired mitochondria damage
cell death
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Shock – Effects on Organ Heart – ↓ CO / hypotension / myocardial
depressants Lung - ↓gas exchange / tachypnoea /
pulmonary edema Endocrine – ADH → ↑ reabsorption of water CNS – perfusion ↓ – drowsy Blood - Coagulation abnormalities – DIC Renal - ↓ GFR - ↓ urine output GIT – mucosal ischaemia – bleeding &
hepatic - ↑ enzyme levels
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HYPOVOLAEMIC ETIOLOGY
Blood loss. haemorrhage
Plasma / body water loss. Electrolytes imbalance.
Vomiting. Diarrhea. Dehydration.
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Valvular heart disease Myocardial infarction.Cardiac arrhythmias.Cardiomyopathy
CARDIOGENIC ETIOLOGY
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OBSTRUCTIVEETIOLOGY
Cardiac Tamponade Pulmonary Embolism Tension Pneumothorax Air embolism
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NEUROGENICETIOLOGY
Paraplegia.Quadriplegia.Trauma to spinal cord.Spinal anesthesia.
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ANAPHYLACTICETIOLOGY
Injections - Penicillins.AnaestheticsStings.Shelfish.
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Gram +Gram - Fungi / VirusProtozoa
SEPTIC ETIOLOGY
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ENDOCRINEETIOLOGY
Hypo & Hyperthyroidism.Adrenal insufficiency.
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Clinical Features
Features of shock depend on the degree of loss of volume & on duration of shock.
Types Mild shock. Moderate shock. Severe shock.
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Mild ShockFeatures
Collapse of subcutaneous veins of extremities esp. the feet, which become pale and cool
Sweat on forehead, hand and feet
Urine output normal. Pulse rate normal. Blood pressure normal. Patient feels thirsty and
cold.
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Moderate ShockFeatures
Mild shock features + drowsy & confused
Oliguria Pulse rate increased
usually less then 100/min.
Blood pressure normal initially then falls in later stage.
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Severe Shock
Features Unconscious. Gasping respiration. Anuria. Rapid pulse. Profound hypotension.
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Stages of shock Initial : The cells become leaky and switch to
anaerobic metabolism. Non-progressive:(compensated stage)
Attempt to correct the metabolic upset of shock. Progressive: (decompensated stage )
Eventually the compensation will begin to fail. Refractory : Organs fail and the shock can no longer
be reversed.
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SHOCK [ Management ]
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MonitoringBlood pressure Heart rateRespiratory rateUrine outputBlood CBCPulse- oximetryECGU/S , CT , X-ray
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Special Monitoring CARDIO – VASCULAR
- Central venous pressure Normal ; 5-10cmH2O, If CVP<5cmH2O
Inadequacy of blood volume CVP>12cmH2O
Cardiac dysfunction
- Cardiac output Pulmonary catheter Doppler ultrasound Pulse waveform analysis
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Special Monitoring
SYSTEMIC & ORGAN PERFUSION
Clinical : urine output & LOC Sr. Lactate estimation & Base defecit Blood gas analysis
PO2 / PCO2 / ph Mixed venous O2 saturation – N – 50-70%
Newer methods Muscle tissue O2 probes Near –infrared spectroscopy Sublingual capnometry
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Guidelines
Treat the cause
Improve Cardiac function
Improve Tissue perfusion
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Goals of Resuscitation Overall goal:
increase O2 delivery decrease demand
Treatment
O2 content Cardiac output
Blood pressure
Sedation/analgesia
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Principles of ResuscitationA: Airway
patent upper airwayB: Breathing
adequate ventilation and oxygenation
C: Circulationplacement of adequate IV
access cardiac function oxygenation
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Fluid Therapy in Shock
Crystalloid Solutions Normal saline Ringers Lactate solution Hartmann’s solution
Colloid Solutions Blood transfusion
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Oxygen Carrying Capacity Only RBC contribute to oxygen carrying
capacity (hemoglobin) Replacement with all other solutions will
support volume Improve end organ perfusion Will Not provide additional oxygen
carrying capacity
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Dynamic Fluid Response
Infusing 250-500ml of Fluid rapidly in 5 - 10 mts.
Responders – Improvement
Transient responders – revert back Non – responders
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Vasopressors / Inotropic Drugs
Vasopressors – Phenylephrine / NA Distributive shock states
Septic shock / Neurogenic
Inotropics - Dobutamine Cardiogenic shock / Severe septic shock
To increase the cardiac output
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Other Treatments Correction of Acid – base balance Steriods - Hydrocortisone Antibiotics Catheterisation Nasal O2 / Ventilatory support CVP Line Control of Pain ICU – Critical care management
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End Points of ResuscitationClassic / Traditional Restoration of blood
pressure Normalization of heart
rate and urine output Appropriate mental
statusImproved / Global All of the above plus Normalization of serum
lactate levels Resolution of base deficit Adequate - MVS
Goal directed approach Urine output > 0.5
mL/kg/hr CVP 5 -10 cm H2o MAP 65 to 90 mmHg Central venous
oxygen concentration > 70%
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Practically Speaking…. Know how to distinguish different types
of shock and treat accordingly. Look for early signs of shock. Monitor the patient using the HR, MAP,
mental status, urine output. SHOCK is not equal to hypotension. Start antibiotics within an hour !
Do not wait for cultures or blood work.
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1.All of the following are causes related to Obstructive shock except -
A Cardiac tamponade.B Air embolism. C Cardiac arrhythmias. D Pulmonary embolism.
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2.Which of the following is the agent of choice in Severe septic shock ?
A Vasopressin.B Adrenaline.C Phenylephrine.D Dobutamine.
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3. A 19-year-old male is brought to the hospital after sustaining an abdominal injury while playing rugby. He is complaining of left upper abdominal pain and has some bruising over the same area. His pulse is 140/min and his BP is 100/82mmHg. What is the type of shock?
A Septic shock.B Cardiogenic shock.C Hypovolaemic shock.D None of the above.
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4.Which of the following is not a newer methods for monitoring tissue perfusion -
A Muscle tissue O2 probe.B Doppler ultrasound.C Infrared spectroscopy. D Sublingual capnometry.
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5.Which of the following is one of the last signs of shock ?
A Profound hypotension.B Tachycardia.C Prolonged capillary refill.D All of the above.
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THANK YOU
THANK YOU . . .